Would a vampire drink a diabetic's blood?

Answer 1

Vampires are fictional. They can do whatever the author wishes.

A diabetics blood would be sweet with excess sugar but then have a metallic tang due to the acetone. I would think that it would not be considered the best sort of blood to drink.

Answer 2

It would depend on the vampire lore being considered. In some, diabetic blood may be less appealing due to the high sugar content. In others, a vampire's preference for blood may not be affected by the donor's health conditions.